Sickle grinder



JNENTOR.

2 Sheets-Sheet 1 iM ||..l... l l

OO OO C. STADICK SICKLE GRINDER :EEE-222::ti

sept. A27, 1955 Filed Jan. 14, 1953vv NWMW Sept. 27, 1955 F'led Jan. 14,1953 C. STADICK SICKLE GRINDER 2 Sheets-Sheet 2 INV NroR. @2/Wd ma? BYUnitedV StatCS Patent j My invention relates to sickle grinders, and hasfor its primary object the provision of a novel mechanism for thesharpening of -generally triangular cutting blades of a sickle withoutremoving samefrom the -sickle bar.

A still further object of my invention is the provision of a device ofthe class described which is provided with a power driven grinding wheelwhich is so mounted as to enable the operator to quickly and easilyadjust the position of same so as to obtain any desired angulation orposition of the cutting faces thereof.

A still further object of my invention is the provision of a novel meansfor suspending or mounting the sickle bar, including yielding means,whereby any desiredl position of the cutting blades,'with respectto thegrinding wheel, may be quickly and easily arrived at.

A still further object of my invention is the provision of a device ofthe class described which is inexpensive and simple in construction, yetdurable in use.

A, still further objectv of my invention is the provision of a device ofthe class described which is extremely easy to operate, yet is highlyefficient in use.

The above and still further objects of my invention will become apparentfrom the following detailed specification, appended claim, and attacheddrawings.

Referring to the drawings, wherein like characters indicate like partsthroughout the several views:

Fig. 1 is a view in plan of my novel structure, one position of theparts thereof being shown by dotted lines;

Fig. 2 is a view in front elevation of the structure of Fig. l; and

Fig. 3 is a View partly in end elevation and partly in vertical section,as seen from the line 3-3 of Fig. 2.

Referring with greater particularity to the drawings, the numeral 1indicates a horizontally-disposed generally rectangular frame made up ofangular, parallel, front and rear members 2 and 3, respectively, andjoining end members 4 and 5. Preferably and as shown, the frame 1 issupported from the floor by means of legs 6 at each corner. Theupstanding sides 7 of the angular front and rear members 2 and 3,respectively, define an elongated guideway in the nature of rails.Carriage 8, preferably and as shown in the nature of a rectangularplate, has laterally-spaced pairs of trunnions 9 projecting outwardlyfrom opposite sides. Iournalled for rotation on the trunnions 9 arerollers 10 having concave peripheral surfaces 11 adapted to receive theupstanding rail-acting sides 7 of the frame members 2 and 3 therein. Inthis manner, the carriage 8 is mounted for longitudinal slidingmovements with respect to the frame 1. In order to manually impartreciprocal movements to the carriage 8 along the tracks 7, I provide aconventional chain 12 secured at its opposite ends to frame members 4and S, respectively, and positioned therebeneath. Depending from thecarriage 8 are a pair of laterally-spaced bearing legs 13, through whichpasses for rotation a shaft 14 having a handle 15 at its forward end,and a sprocket 16 at its rear end. As shown, sprocket 16 has meshing enl2,718,733 Patented Sept. 27, 1955 gagementwith :the `chain 12.` Endthrust of the shaft` 14, with respect to the bearing legs 13, isvprevented by screw-equipped collars 17. l It should be obvious thatrotation of the crank-acting handle 15 causes the sprocket 16, totravelyon the .chain y12, and `to simultaneously move the carriagel 8`longitudinally` of the frame 1, the rollers 10 rolling upon therail-acting sides 7 of the frame mem- .A base plate 18 overliesthecarriage 8 and `is connected thereto for' swinging movements in theplane thereof through themedium of `a strap 19, which projects forwardlyand has its free end 20 pivotally secured thereto through the mediumrofa nut-equipped bolt 21. Rigidly securedl by welding or` 4the like tothebase plate 18 and projecting `upwardly therefrom-,are a pair oflaterallyspaced posts22, through the upper ends of which projects ashaft23. vMounted at their upper ends for swinging movements about the shaft23 are a pair of laterallyspaced supporting legs 24. At the lower ends,the supporting legs'24,-arev angularly out-turned to provide sup-lporting feet25.to which, by means of threaded bolts or the ;like264 issecured a motor-mounting plate or member `27. An electric motor 28 issecured to the motor mounting plate 27 by means of threaded bolts orthe` like 29. Forlthe purpose of positioning the motor mount'- i bymeansof -a nut 34 or the `like,`is an abrasive or grinding wheel .-35,preferablyand as shown'having a beveled peripheral grinding face 36thereon. It will be noted that the drive shaft 33 of the motor 28 isdisposed at an oblique angle with respect to the shaft 23 upon which thelegs 24 are pivotally mounted, and that the axis of the grinding wheel35 intersects the axis of said shaft 23. It will also be observed thatthe axis of the pivot bolt 21 is substantially tangent to the peripheralsurface 36 of the grinding wheel 35.

Projecting rearwardly from the frame member 3, one each adjacentopposite ends thereof, are a pair of lugs 37 to which are rigidlysecured a pair of standards 38. A pair of horizontally-disposedsupporting arms 39 have their rearward ends slidably adjustably securedwithin heads 40, as indicated at 41. Heads 40 are slidably adjustablysecured to the upper ends of the standards 38, as indicated at 42. Thisarrangement makes possible horizontal and vertical adjustments of thearms 39 with respect to the standards 38. The free ends of the arms 39terminate adjacent the vertical plane of the front edge of the frame 1,preferably and as shown in forwardly spaced relation thereto. A pair ofcoil springs 43 are connected one each at their upper ends to the freeends of the arms 39, as indicated at 44. At their lower ends, thesprings 43 have hooked engagement with the upper ends of sickle barclamping members, identified in their entirety by the numeral 45, andeach including a vertically-disposed rod 46. Rods 46 are, as shown, bentbackwardly upon themselves at their lower ends, as indicated at 47, tonestingly receive the rear end portion of a sickle bar 48. Slidablyadjustably mounted on the upper end portions of the rods 46 are clampingfingers 49, which are notched, as at 50, to receive the forward endportions of conventional triangular-shaped cutting knives 51,customarily secured to the sickle bar 48 in side by side relation bymeans of rivets or the like 52. The thumb screws for releasably lockingthe ngers 49 to the rods 46 are identified by the numeral 53.

By the above described arrangement, it should be obvious that theperipheral grinding face 36 of the grinding wheel 35 may be moved to anydesired operative position'without changing the distance therebetweenandl the axis of the pivot bolt. rlhis is extremely important becausedifferent angular positions of the grinding face 36 are necessary-fortheeffective'and' eiiicieit sharpening of the angular faces ofthecutting knives 51.' "Further more, it shouldbe'ob'viousthatbecauselof the yielding connection between the c ilamping members'45: and arms, 39, that the maximum degree'ofuniversalj' y A ment by thecutter barV at the 'grindingvs'fljieelv is achieved, Obviously, a stillfurther benefit 'of this yielding'connection is that the operator isrelieved of the necessity'of' carrying the weight ofl the sickle bar`when'sha'rpenig the knives thereof, a'nd needs only to guide and'diectIn operation,` the operator'attachesr'the sickle bar"4'8 in the elampingmembers 4S with the 'u'tting knives 51 positioned upwardly, as shown inFig. 21 rlfhe carriages is then positioned adjacent one endof'the sickleba""48 by manipulation of the crank'handl'e 15. The sickle/bar; underthe yielding tension of the springs 43 may be readily'l tilted inopposite directions by raising'and lowering either end, whereby toobtain proper and desired engagement of the converging knife-acting sideedges of theV cutting knives 5'1'with the peripheral sur-face 36 ofthe'grinding wheel 35. The carriage' 8 and grinding wheel '35 mountedAthereon are advanced from'tooth to tooth as desired; libwever, duringthe sharpening of the side edges of afgiven blade, or alternately duringthe sharpening of the diveijging edges of adjacent blades, the carriage8 and grinding wheel 35 remain'fixed on 'the tracks 7. Y

My invention has been thoroughly tested and found to be completelysatisfactory for y"the accomplishment of the above objects, and while Ihave shown a commercial embodiment of my invention, it should 'beobvious' that same 11S capable of modification without departure from eA grinder for sickle bars including a horizontally disposed framedefining an elongated guideway, a carriage mounted for sliding movementson said guideway, means for imparting reciprocal movements to saidcarriage on said guideway, a power operated grinding wheel on saidcarriage, a pair of laterally spaced standards secured to said frame andprojecting upwardly adjacent the rear side of said guideway, a pair. fgenerally horizontally disposed supporting arms one each secured to oneof said standards and having their lfree ends terminating in a verticalplane forwardly. of the front edge of said frame, a pair of verticallydisposed, laterally spaced sickle bar clamping members, andl coilsprings connecting the upper end portions of said clamping members oneeach to the free ends of said supporting arms, said clamping membersincluding vertically disposed rods, said rods being bent backwardly uponthemselves at their lower ends to nestingly receive the rear end portionof said sickle bar, and slidably adjustable vclamping fingers en saidvertically disp'esedfrods, said clamping'iing'ers being providedwithnotches to receive the Yorwar'd end portions of the cutting knivescarriei'byl said sickle bar;v

References Criteri inthe iile of this patent um@ STATES PATENTS

